We did some experimentation heat distortion on the background, and you'll find the results in this update. It looks pretty solid, though the additional pixel shader work required means it's a bit sluggish on some of the older Tegra2 high-res devices. As a result we're defaulting it to off, but please give it a try and see what you think!

In addition, this update contains the various maintenance stuff other recent updates have, including Daydreams and simulated scrolling and so on. The settings screen is now using the Holo theme and has a nicer thumbnail-using list for picking the background image, as a bonus.